Display device including foldable display panel

Abstract

A display device includes a display panel that may be folded with reference to at least one folding axis, a polarization layer disposed on the display panel, an adhesive layer disposed on the polarization layer, and a window disposed on the adhesive layer, and having one surface facing the adhesive layer. A 180 degree (°) peel adhesion of the adhesive layer to the one surface of the window may be about 493 gram-force per inch (gf/inch) to about 817 gf/inch under the conditions of a temperature of about 60 degrees Celsius (° C.) and a relative humidity of about 93 percent (%). Accordingly, the display device including the adhesive layer may exhibit good durability, and maintain the reliability thereof.

What is claimed is: 
     
       1. A display device comprising:
 a display panel which is foldable with reference to at least one folding axis; 
 a polarization layer disposed on the display panel; 
 an adhesive layer disposed on the polarization layer; and 
 a window disposed on the adhesive layer, and including one surface facing the adhesive layer, 
 wherein a 180 degree peel adhesion of the adhesive layer to the one surface of the window is about 493 gram-force per inch to about 817 gram-force per inch under conditions of a temperature of about 60 degrees Celsius and a relative humidity of about 93 percent. 
 
     
     
       2. The display device of  claim 1 , wherein the adhesive layer comprises an acrylic resin and a silane coupling agent. 
     
     
       3. The display device of  claim 1 , wherein the one surface of the window is one surface of a glass substrate, and
 the 180 degree peel adhesion of the adhesive layer to the one surface is about 493 gram-force per inch to about 556 gram-force per inch. 
 
     
     
       4. The display device of  claim 1 , wherein the one surface of the window is one surface of a plasma-treated glass substrate, and
 the 180 degree peel adhesion of the adhesive layer to the one surface is about 636 gram-force per inch to 817 gram-force per inch. 
 
     
     
       5. The display device of  claim 1 , wherein, when a stress of about 1,900 pascals to about 2,000 pascals is applied for about 10 minutes to the adhesive layer under the conditions of the temperature of about 60 degrees Celsius and the relative humidity of about 93 percent, a creep value of the adhesive layer is about 16 percent to about 18 percent. 
     
     
       6. The display device of  claim 1 , wherein, when a stress of about 1,900 pascals to about 2,000 pascals is applied for about 10 minutes to the adhesive layer under the conditions of a temperature of about 60 degrees Celsius and a relative humidity of about 93 percent, a residual strain of the adhesive layer after an elapse of additional about 10 minutes is about 0.6 percent to about 0.9 percent, and a recovery rate of the adhesive layer is about 95 percent to about 96 percent. 
     
     
       7. The display device of  claim 1 , wherein, when a stress of about 9,900 pascals to about 12,210 pascals is applied for about 10 minutes to the adhesive layer under the conditions of the temperature of about 60 degrees Celsius and the relative humidity of about 93 percent, a creep value of the adhesive layer is about 94 percent to about 101 percent. 
     
     
       8. The display device of  claim 1 , wherein, when a stress of about 9,900 pascals to about 12,210 pascals is applied for about 10 minutes to the adhesive layer under the conditions of the temperature of about 60 degrees Celsius and the relative humidity of about 93 percent, a residual strain of the adhesive layer after an elapse of additional about 10 minutes is about 3 percent to about 4 percent, and a recovery rate of the adhesive layer is about 95 percent to about 96 percent. 
     
     
       9. The display device of  claim 1 , wherein a thickness of the adhesive layer is about 10 micrometers to about 70 micrometers. 
     
     
       10. The display device of  claim 1 , wherein the adhesive layer comprises a polymer resin having a glass transition temperature of about −40 degrees Celsius or less. 
     
     
       11. The display device of  claim 1 , wherein the polarization layer has a Young's modulus of about 9,600 megapascals to about 9,800 megapascals at a temperature of about −20 degrees Celsius, and
 a Young's modulus of about 6,900 megapascals to about 7,100 megapascals at the temperature of about 60 degrees Celsius. 
 
     
     
       12. The display device of  claim 1 , wherein the polarization layer has a Young's modulus of about 8,300 megapascals to about 8,500 megapascals under conditions of a room temperature and a relative humidity of about 40 percent to about 50 percent, and
 a Young's modulus of about 3,200 megapascals to about 3,400 megapascals under the conditions of a temperature of about 60 degrees Celsius and a relative humidity of about 93 percent. 
 
     
     
       13. The display device of  claim 1 , wherein the display device is in-foldable with reference to the at least one folding axis. 
     
     
       14. The display device of  claim 1 , further comprising a shock absorbing layer disposed between the adhesive layer and the polarization layer, wherein the shock absorbing layer has
 a Young's modulus of about 5,500 megapascals to about 6,600 megapascals at a temperature of about −20 degrees Celsius, and 
 a Young's modulus of about 4,300 megapascals to about 5,100 megapascals at the temperature of about 60 degrees Celsius. 
 
     
     
       15. The display device of  claim 14 , wherein the shock absorbing layer has
 a Young's modulus of about 5,000 megapascals to about 5,900 megapascals under conditions of a room temperature and a relative humidity of about 40 percent to about 50 percent, and 
 a Young's modulus of about 3,900 megapascals to about 4,700 megapascals under the conditions of the temperature of about 60 degrees Celsius and the relative humidity of about 93 percent. 
 
     
     
       16. The display device of  claim 1 , further comprising:
 at least one functional layer disposed under the display panel; and 
 an auxiliary adhesive layer disposed under the at least one functional layer, and 
 wherein the 180 degree peel adhesion of the auxiliary adhesive layer to the at least one functional layer is about 493 gram-force per inch to about 817 gram-force per inch under the conditions of the temperature of about 60 degrees Celsius and the relative humidity of about 93 percent. 
 
     
     
       17. A display device comprising:
 a display panel which is foldable with reference to at least one folding axis; 
 a polarization layer disposed on the display panel; 
 an adhesive layer disposed on the polarization layer; and 
 a window disposed on the adhesive layer, and including one surface facing the adhesive layer, wherein, 
 when a stress of about 1,900 pascals to about 2,000 pascals is applied for about 10 minutes to the adhesive layer under conditions of a temperature of about 60 degrees Celsius and a relative humidity of about 93 percent, the adhesive layer has a creep value of about 16 percent to about 18 percent, and, 
 when a stress of about 9,900 pascals to about 12,210 pascals is applied for about 10 minutes to the adhesive layer under the conditions of the temperature of about 60 degrees Celsius and the relative humidity of about 93 percent, the adhesive layer has a creep value of about 94 percent to about 101 percent. 
 
     
     
       18. The display device of  claim 17 , wherein a 180 degree peel adhesion of the adhesive layer to the one surface of the window is about 493 gram-force per inch to about 817 gram-force per inch under the conditions of the temperature of 60 degrees Celsius and the relative humidity of about 93 percent. 
     
     
       19. The display device of  claim 17 , wherein the adhesive layer comprises at least one among trimethoxy(3-(oxiranyl-2-methoxy)propyl) silane, 3-glycidoxy propyl trimethoxy silane, 3-glycidoxy propyl triethoxy silane, 3-(2,3-epoxypropoxypropyl)methyldimethoxysilane, 3-(2,3-epoxypropoxypropyl)methyldiethoxysilane, 2-(3,4-epoxycyclohexyl)ethylmethyldimethoxysilane, and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane. 
     
     
       20. The display device of  claim 17 , wherein the window comprises a glass substrate, and the window further comprises a protective layer disposed on the glass substrate.